Direct detection of the ≈8.4eV internal conversion energy of Th229m embedded in a superconducting nanowire
Galen O'Neil, Kjeld Beeks, Eric Hudson, Justin Jeet, David Leibrandt, Marion Mallweger, Sae Woo Nam, Sayan Patra, Gil Porat, Dileep Reddy, Thorsten Schumm, Stephen B. Schoun, Benedict Seiferle, Christian Schneider, Lars von der Wense, Peter G. Thirolf, Varun Verma, Jun Ye, Chuankun Zhang
DOI 10.1103/9v5w-b8k2 · Physical Review C
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Abstract
We report on a direct measurement of the ≈8.4eV nuclear excitation energy of the isomeric first-excited state Th229m via the internal conversion (IC) decay channel. Thermalized and mass-filtered recoiling Th229m ions from U233α decay are delivered to the surface of a superconducting nanowire sensor and become embedded. The ion is neutralized, triggering the IC decay, and the energy released by the IC decay is detected with high quantum efficiency by the nanowire sensor. Energy resolution is enabled by the current dependence of the internal quantum efficiency of the nanowire sensor. The techniques presented here are complementary to light-based detection schemes. The IC decay channel is about eight orders of magnitude faster than the photoemission channel, thus the ability to detect IC decays with high efficiency with superconducting nanowire sensors is likely to be a valuable tool for future Th229m experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MoSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | onset |
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